C 1500 Truck 2WD V8-5.3L VIN T (1999)
Fuel Tank Pressure Sensor: Description and Operation
Manifold Absolute Pressure (MAP) Sensor
The Fuel Tank Pressure sensor operates on the same principle as the MAP sensor. The Fuel Tank Pressure sensor measures the difference between the
outside air pressure and the air pressure (or vacuum) in the fuel tank.
The Fuel Tank Pressure sensor mounts to the fuel tank sending unit. A three wire electrical harness connects the sensor to the PCM. The PCM supplies a
5.0 volt reference voltage and a ground to the sensor. The sensor returns a voltage between 0.1 and 4.9 volts on the signal circuit.
